Jing Miao

Synthesis and Application of Polyoxymethylene Dimethyl Ethers

Polyoxymethylene dimethyl ethers (DMMn) were synthesized in moderate yields by the reaction of methylal and paraformaldehyde catalyzed by solid acid. The pure components of DMM2, DMM3, DMM4, and DMM5 obtained by rectification were characterized by 1H NMR and mass spectra. The suitable components for blending into fuel were obtained by distillation separation. Furthermore, the combustion and emission characteristics of a diesel engine fueled with diesel and a blended fuel of DMM3-5 and diesel were investigated respectively.

Study on Preparation and Photoelectrocatalytic Activity of Supported TiO2 Catalysts

TiO2/α-Al2O3 is prepared by liquid-phase deposition method from titanium ammonium fluoride. The morphography and crystal form of supported catalyst are analyzed by XRD and SEM. The results show that anatase is detected when the calcination temperature is 800°C, the interaction of TiO2 and support inhibit TiO2 transfer into anatase. The addition of polyvinyl alcohol makes the active component evenly distributed. It is found that when support for catalyst is honeycomb column α-Al2O3, loading amount is 4.0%, and calcination temperature is 800°C, the CODcr removal rate could reach 66%. Furthermore, no obvious evidence of deactivation and intensity for the catalyst could be seen after running for 100 hours.